In SONAR’s Step Record dialog box, duration means the actual length of time that a note sounds, as opposed to the notated value of the note, which could be different. If you check the Follow Step Size option in the dialog box, the notated value and the duration are the same.

Multi Media Extensions—the name of Windows’ built-in audio and multmedia software that was originally developed for Windows 3.0, and is still used by many sound card drivers. WDM drivers offer much better performance.

Frequency dependent time delay. All frequencies experience phase, but as a whole this is not noticeable as they are affected uniformly. If frequencies fall out of phase, however, they interfere with each other constructively or destructively. This can be measured by calculating the period length, as well as amplitude and magnitude values of a recorded wave form. If two frequencies fall 180 degrees out of phase, they will enduce destructive interference and thus completely cancel each other out.